It was settled science

In 1975, Newsweek Predicted A New Ice Age. We’re Still Living with the Consequences.

https://longreads.com/2017/04/13/in-1975-newsweek-predicted-a-new-ice-age-were-still-living-with-the-consequences/

Excerpt: On April 28, 1975, Newsweek published a provocative article, “The Cooling World,” in which writer and science editor Peter Gwynne described a significant chilling of the world’s climate, with evidence accumulating “so massively that meteorologists are hard-pressed to keep up with it.” He raised the possibility of shorter growing seasons and poor crop yields, famine, and shipping lanes blocked by ice, perhaps to begin as soon as the mid-1980s. Meteorologists, he wrote, were “almost unanimous” in the opinion that our planet was getting colder. Over the years that followed, Gwynne’s article became one of the most-cited stories in Newsweek’s history.